The question had arisen as to the origin of Baptism for health by Bro[ther]. Hyrum M. Smith, seeking information on this subject.
President Smith remarked that it had been customary to baptize for health from the early rise of the Church, and he related specific incidents showing the good effects resulting therefrom.
Pres[iden]t. Lund also related incidents of a like character which had taken place in the Manti temple, and remarked that there evidently exists some connection between forgiveness of sin and healing, and that this understanding obtained in the days of the Savior and the Apostles afterwards. And while he felt that we should not encourage the idea of baptism for health, he felt that we should not discourage it when the desire was prompted by those asking permission to be baptized for their health. ...
[Source: First Presidency and Quorum of the Twelve minutes]